Binocular



Patented Jan. 1,J 1924.

BINOCULAR. f

Application ined April s,

T0 all whom t may concern.' j v Be it known that I, KARLVA.V EDs'rRoM, a citizen of the vUnited States, residing at Denver, in the countyV of Denver and' State of Colorado, have invented certain new and useful Improvements in Binoculars, of which the following is a specification.

This invention relates to` binoculars; and more particularly to the focal yand interpupillary adjustments therefor.

It is the object of the present invention to provide an easilyoperated mechanism vof simple and effective construction for moving the eye pieces of a binocular'telescope relative to the respective objective casingsto obtain dierent focal. adjustments;

Another object of the invention is to provide a simple dust-tight means for mounting the eye pieces upon the objective casings, which permits of the eye pieces being separately`v moved for secondary focal adjustments Iwithout strain upon the arms Vby which they'are pivotally connected."l

With these and other objects in view all of which will be'fully disclosed in the course of the following description, my invention consists of the constructions 'and arrangements of partsvshown in the accompanying drawings in the several views of which corresponding` parts. are similarly designated and in whic Figure l is a sectional elevationof a binocular telescope constructed in accordance with'the present invention;

Figure 2, an enlarged longitudinal section through the focal; adjustmentV ofthe same; t

Figure 3, a similar section showing amod1' fied construction of the adjusting mechanism, and n Figure 4, an enlarged section throughone of the'eyepieces of the binocular showing in detail the means by which they are mounted for separate adjustmentk withrelation tothe respective objective casings.

Referring more'specically to the draw-- ings'the reference numerals 2 designate the two objective casings of a Vbinocular telescope, which as usual have a hinged connection for their relative adjustment to permit of varying the pupillary'distan'ce Ybetween theirV lenses. f i' Y the lens holder; and the 1920. serial Np. 372,2sa.

The hinged connection Vofthe casings .em-l bodies mechanism fo'r thefocal adjustment ofV the eye pieces which are .mountedffor independent 'secondary adjustment at the ends of thecasings inthe followingmanner.v si A hollow stem or 'barrel 3 upony whichfthe moving parts'oftheeye piece are supported isscrewed into an opening in the zend ofthe l* casing and extends'exteriorly thereof, the positionof thestem being definitely established bythe engagement of a jc/ircumferent'ial flange v4 "with the outer surface of the casing; f A hinged connection'between the twoeyepieces is obtained by a pair of arms. 5 the free ends of which are pivotallyy connected'` in alinement with the pivotal jective casings and which at their opposite ends are provided'with sleevesf rotatably. Y fitted'upon the barrels 3. Y

Y Gaskets 7 "ofvelvet orvothersuitable fabric are interposed' between 'thebarrels and the respective sleeves to eircludedirt and ab- T:

sorb lateral pla KARL L EDSTROM, 0F DENVER, COLORADO.`

'axis of thejob-V To e eye-piece proper consists of a tubular lens-holder 8 provided withv acircurnferentialcollar 9 and having an external screwthre'ad atitsouter end' for the connection ofthe eye-cap 10.` lThelen's-holder which extends through the barrel on theolojectivecasingcarries Va concentric slide ringV l2 and exteriorlythereofathumb-shell 13, the ring being slidablyv fitted around'the'sleeve 6 of' i* the respective hinge arm, tocooperate thereV with for -focal 'adjustment' of the jeye-'piece'. y'

The ring and thevshell haveV at theirfup- Y per -ends inwardly extending anges by whichV yth'eyare secured between the collar on v screw-threadedV cap 10, anda dowelp'in 14T on thelens-holder fitted in correspondingly formedY notchesin Y the "inner edges of' said langesconnects the parts lfor conjunctive rotation.

The cooperative connection Ybetween ,the slide of theeye-piece and the sleevev on the hinge arm upon which ,it is mounted,'is1es`f tablished byV astud l5 on fthe sleeve which extendsV freely intoY a obliquely` extending slot 16 of the sliding ringY Itfwillbe apparent'thatalrotarymotion imparted to the thumb shell of the eyepiece ico Y and communicated to the slide through therrp. 'Y

intermediary of the dowel pin will cause said slide to move longitudinally upon the stud of the hinge sleeve, the longitudinal movement of the slide being communicated to the lens-holderof the eyeV piece vof which it is a part, to vary the distance between the lenses in the holder of the eye pieceand the lenses in the respectivevobjective casing in case a dierence in the visual power of the eyes of a. person using the binocular demands a secondary adjustment of either eye piece after the conjunctivefocal adjustment of the two eye piecesrelativeto the objective casings has'been'obtained. Y

The" means'for effectingthe main t'ocal adjustmentofthe eye pieces of the binocular consists in the preferred iormvot1 the invention illustrated in Figure 2 of the drawings, of the following'assemblage of' cooperating parts.v

T heV objective casings `have for their hinged connection two pairsof arms 17 provided at their adjoiningfends with complimentary parts of Vi'dush iknuckle joints which are in axialalinement with each other and with the ycorrespondingly formed joint of the" beforementionedhinge arms 5 of the eye pieces.y Y

A distance sleeve-18 placed between the pairs of arms 'of the objective casings to maintain theirparallelism, provides al casing for Va tubular pintllel)y which extends through alinedopen'ings ofthe knuckles and is lheld against.longitudinal displacement by a head 2O at roneend and a headed screw plug 2l at its opposite end.

The plug which is screwed vinto the pintle carriesva'n 'integral 'screw bolt22'in cooperativey engagement with a correspondingly threaded elongate nut 23 which is rotatably` fitted insi'dethenhollow 'pintle The nut ,has in addition to the 4internal thread which cooperateswith the screw bolt on the plug, a second internal thread of opposite direction which engages with a screw 2liextendedfromlthe pin' 25 by 'which the hinge arms of the' eye pieceslare pivotally connected.r`

vThe vknuckles :of the last-mentioned arms which like'thoseof the arms on the casings are formed to provide a iush joint, are held together byl a an'ge 26 on the pin 25"`and a cap' 27 which is fastened onthe pin by a headedscrew 28 eiitending in a' threaded opening inthe end thereof;

The cap` is heldlagainst rotation on one of the armsr by vawdowel epin 29 and it may be graduated. as at 30 to cooperate with a fixed mark onthe otherarm to indicate the pupillary distance between the eyepieces after pivotal adjustment'of the vcasin'gs.c e

The elongate nut23 projects vbeyond the end of thetubular'pintlein which it is fitted, for VVits connection with a knurled thumb wheel 31 intermediate of the arms of the eye pieces and the adjacent pair of arms of the n 4tl'irough themedium of its thumb wheel, it

being apparent that the rotary movement ofthe nut upon the relatively stationary screw bolt 22 causes it to move longitudi` nally andattlie same time imparts a corresponding axial movementto the screw 214.011

the extension of tthe Ipivot pin.;which is heldv against rotation on' the Y arms Q b'y" which the eye pieces areconnected.' s The construction shown in Figure, B ,ditf ters from the other .in thatthe' nut'z'whichgco'- operates with the screw'- on the pivot of the @y-'pierce arras, lyvthadedas at 31 toengagejjwith a corresponding interior thread offthepintle.'

The .external 'and 'internal threads of ythe nufafe cui in' Opposite dreams @what when the'thumb wheel iswr ated, the

and the/pvot' Pin @fthe 'eye-Pisa@ will both move longitudinally for 'the focal"y adjustment of the instrument, i

It will be seen that the screw connection between the nut' andlthegpiiitle of ,the'lastidescribed construction is Atufnctionally(equinalent to the connectionoitheA nut'w'ithhthe screw bolt of the ,other that thefenlyv difference between y' tlfiev two of l 'the' focal adjustment is one of structural gdejsitnil..

n Win be Observed that the ser@ sind screw bolt 22 vare tofsucli length@that'yvlien-V the nut 23 is rotated in onedirectionthatgthe screw 24 will contact thebolt 22.` r"Thus they movement of the arrnstowards the jacent ends of the casing/s 2" is lin'iitedy sont at should a person continue torotate that y wheel 3l movement vof the screw 2 ll be arrestedby lcontactwith'tl'ie scre`w`-i2'2f;

nthis manner no strain will'bejimparted to the arms 5 atr their points offconnection with the pin`25 landeyefplieces'10wthereby preventing the arms ,from becoming .weakf ened or worn7 whichwould be"'veryolojvgc#v tionable in articles of this character. T

What I Claim and dsir te ,Seiirelbrfetr gagement interio'rlyv with the c at, one

end, said plug having a screw bolt formed integral therewith for threaded engagement in said nut the head of said plug bearing against an adjacent casing arm, a pin pivot ally connecting the arms of the eye pieces,` a. screw carried by the pin for threaded engagement in the nut, said screw and screw bolt 'having oppositely threaded engagementl forth.

In testimon signature.

whereof I have affixed my VKARL A. EDsTRoM. 

